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/* Copyright (c) 2000, 2018, Oracle and/or its affiliates. All rights reserved.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License, version 2.0,
as published by the Free Software Foundation.
This program is also distributed with certain software (including
but not limited to OpenSSL) that is licensed under separate terms,
as designated in a particular file or component or in included license
documentation. The authors of MySQL hereby grant you an additional
permission to link the program and your derivative works with the
separately licensed software that they have included with MySQL.
Without limiting anything contained in the foregoing, this file,
which is part of C Driver for MySQL (Connector/C), is also subject to the
Universal FOSS Exception, version 1.0, a copy of which can be found at
http://oss.oracle.com/licenses/universal-foss-exception.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License, version 2.0, for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
/**
@file mysys/my_open.cc
*/
#include "my_config.h"
#include <errno.h>
#include <fcntl.h>
#include <stddef.h>
#include <sys/types.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include "my_dbug.h"
#include "my_inttypes.h"
#include "my_io.h"
#include "my_sys.h"
#include "my_thread_local.h"
#include "mysql/psi/mysql_mutex.h"
#include "mysql/service_mysql_alloc.h"
#include "mysys/mysys_priv.h"
#include "mysys_err.h"
/*
Open a file
SYNOPSIS
my_open()
FileName Fully qualified file name
Flags Read | write
MyFlags Special flags
RETURN VALUE
File descriptor
*/
File my_open(const char *FileName, int Flags, myf MyFlags)
/* Path-name of file */
/* Read | write .. */
/* Special flags */
{
File fd;
DBUG_ENTER("my_open");
DBUG_PRINT("my",
("Name: '%s' Flags: %d MyFlags: %d", FileName, Flags, MyFlags));
#if defined(_WIN32)
fd = my_win_open(FileName, Flags);
#else
fd = open(FileName, Flags, my_umask); /* Normal unix */
#endif
fd = my_register_filename(fd, FileName, FILE_BY_OPEN, EE_FILENOTFOUND,
MyFlags);
DBUG_RETURN(fd);
} /* my_open */
/*
Close a file
SYNOPSIS
my_close()
fd File sescriptor
myf Special Flags
*/
int my_close(File fd, myf MyFlags) {
int err;
DBUG_ENTER("my_close");
DBUG_PRINT("my", ("fd: %d MyFlags: %d", fd, MyFlags));
mysql_mutex_lock(&THR_LOCK_open);
#ifndef _WIN32
do {
err = close(fd);
} while (err == -1 && errno == EINTR);
#else
err = my_win_close(fd);
#endif
if (err) {
DBUG_PRINT("error", ("Got error %d on close", err));
set_my_errno(errno);
if (MyFlags & (MY_FAE | MY_WME)) {
char errbuf[MYSYS_STRERROR_SIZE];
my_error(EE_BADCLOSE, MYF(0), my_filename(fd), my_errno(),
my_strerror(errbuf, sizeof(errbuf), my_errno()));
}
}
if ((uint)fd < my_file_limit && my_file_info[fd].type != UNOPEN) {
my_free(my_file_info[fd].name);
my_file_info[fd].type = UNOPEN;
}
my_file_opened--;
mysql_mutex_unlock(&THR_LOCK_open);
DBUG_RETURN(err);
} /* my_close */
/*
Register file in my_file_info[]
SYNOPSIS
my_register_filename()
fd File number opened, -1 if error on open
FileName File name
type_file_type How file was created
error_message_number Error message number if caller got error (fd == -1)
MyFlags Flags for my_close()
RETURN
-1 error
# Filenumber
*/
File my_register_filename(File fd, const char *FileName,
enum file_type type_of_file,
uint error_message_number, myf MyFlags) {
char *dup_filename = NULL;
DBUG_ENTER("my_register_filename");
if ((int)fd >= MY_FILE_MIN) {
if ((uint)fd >= my_file_limit) {
#if defined(_WIN32)
set_my_errno(EMFILE);
#else
mysql_mutex_lock(&THR_LOCK_open);
my_file_opened++;
mysql_mutex_unlock(&THR_LOCK_open);
DBUG_RETURN(fd); /* safeguard */
#endif
} else {
dup_filename = my_strdup(key_memory_my_file_info, FileName, MyFlags);
if (dup_filename != NULL) {
mysql_mutex_lock(&THR_LOCK_open);
my_file_info[fd].name = dup_filename;
my_file_opened++;
my_file_total_opened++;
my_file_info[fd].type = type_of_file;
mysql_mutex_unlock(&THR_LOCK_open);
DBUG_PRINT("exit", ("fd: %d", fd));
DBUG_RETURN(fd);
}
set_my_errno(ENOMEM);
}
(void)my_close(fd, MyFlags);
} else
set_my_errno(errno);
DBUG_PRINT("error", ("Got error %d on open", my_errno()));
if (MyFlags & (MY_FFNF | MY_FAE | MY_WME)) {
char errbuf[MYSYS_STRERROR_SIZE];
if (my_errno() == EMFILE) error_message_number = EE_OUT_OF_FILERESOURCES;
DBUG_PRINT("error", ("print err: %d", error_message_number));
my_error(error_message_number, MYF(0), FileName, my_errno(),
my_strerror(errbuf, sizeof(errbuf), my_errno()));
}
DBUG_RETURN(-1);
}
#ifdef EXTRA_DEBUG
void my_print_open_files(void) {
if (my_file_opened | my_stream_opened) {
uint i;
for (i = 0; i < my_file_limit; i++) {
if (my_file_info[i].type != UNOPEN) {
my_message_local(INFORMATION_LEVEL, EE_FILE_NOT_CLOSED,
my_file_info[i].name, i);
}
}
}
}
#endif
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